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I wish I got my pyrometer a day earlier. I don't like the way this kiln sitter cone looks at all. It was a bisque fire to cone 04 but the cone looks a bit crispy. Usually they just bend but the color doesn't change much. This one is burnt black. (see pic). I can tell that the hazelnut stoneware did not fire to full temp because it's still too red as it should be but it may be bisque higher than I'd like. I had four types of clay in there. Jack Troy Wood fire Porcelain, Jack Troy Wood fire stoneware, Cone 6 Porcelain and cone 6 Hazelnut Stoneware. I have other previously fired bisque pieces downstairs, maybe I'll give them a tap with a screwdriver and see if they sound the same. What could happen if the pieces were bisqued to too high a temp? -Mary